26
TECHNICAL DATA
208
26.1
Engine
26.1.1
All 250 models
Design
1-cylinder 2-stroke engine, water-cooled, with reed intake and
exhaust control
Displacement
249 cm³ (15.19 cu in)
Stroke
72 mm (2.83 in)
Bore
66.4 mm (2.614 in)
Exhaust valve - Beginning of adjustment
5,600 rpm
Exhaust valve - end of adjustment with red auxiliary spring
7,200 rpm
Exhaust valve - end of adjustment with yellow auxiliary spring
7,900 rpm
Exhaust valve - end of adjustment with green auxiliary spring
8,400 rpm
Crankshaft bearing
1 grooved ball bearing/1 roller bearing
Conrod bearing
Needle bearing
Piston pin bearing
Needle bearing
Pistons
Aluminum cast
Piston rings
2 half keystone rings
X (upper edge of piston to upper edge of cylinder)
0… 0.10 mm (0… 0.0039 in)
Z (height of control flap)
48 mm (1.89 in)
Primary transmission
26:72
Clutch
Multidisc clutch in oil bath/hydraulically activated
Gearbox
6-gear, claw shifted
Transmission ratio
1st gear
14:32
2nd gear
16:26
3rd gear
20:25
4th gear
22:23
5th gear
25:22
6th gear
26:20
Ignition
Contactless controlled fully electronic ignition with digital igni-
tion adjustment, type Kokusan
Ignition point (BTDC)
1.9 mm (0.075 in)
Spark plug
NGK BR 7 ES
Spark plug electrode gap
0.60 mm (0.0236 in)
Starting aid
Kick starter and electric starter
26.1.2
All 300 models
Design
1-cylinder 2-stroke engine, water-cooled, with reed intake and
exhaust control
Displacement
293 cm³ (17.88 cu in)
Stroke
72 mm (2.83 in)
Bore
72 mm (2.83 in)
Exhaust valve - Beginning of adjustment
5,600 rpm
Exhaust valve - end of adjustment with red auxiliary spring
7,200 rpm
Exhaust valve - end of adjustment with yellow auxiliary spring
7,900 rpm
Exhaust valve - end of adjustment with green auxiliary spring
8,400 rpm
Crankshaft bearing
1 grooved ball bearing/1 roller bearing
Conrod bearing
Needle bearing
Piston pin bearing
Needle bearing
Pistons
Aluminum cast
Piston rings
2 rectangular rings
X (upper edge of piston to upper edge of cylinder)
0… 0.10 mm (0… 0.0039 in)
Z (height of control flap)
48.5 mm (1.909 in)
Содержание 300 EXC
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Страница 283: ...33 SPECIAL TOOLS 281 Assembly tool 200791 10 Art no T150S Nitrogen filling tool 300574 10 Art no T170S1...
Страница 289: ...3206179en 3206179en 09 2013 KTM Sportmotorcycle AG 5230 Mattighofen Austria http www ktm com Photo Mitterbauer KTM...